Vendor Fira Nerd Font for full glyph coverage

Bundle FiraCode Nerd Font directly in static assets so terminal rendering no longer depends on host-installed Nerd Fonts.

Changes included:
- Added vendored font asset at webterm/static/fonts/FiraCodeNerdFont-Regular.ttf.
- Added bundled font license at webterm/static/fonts/FiraCode-LICENSE.txt.
- Wired local @font-face declarations in webterm/static/monospace.css for both "FiraCode Nerd Font" and "FiraMono Nerd Font" family names used by the existing font stack.
- Documented the capability in README Features as a first-class feature with full glyph/icon support and no external font fetch requirement.

Impact:
- Font glyph/icon rendering is now more consistent across environments.
- Font assets continue to be embedded in the Go binary by default through the existing static embed path.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

README.md

@@ -20,6 +20,7 @@ This repository is the Go port of the original Python implementation, which is p
 - SSE activity updates for fast dashboard refresh
 - Mobile/touch support with virtual keyboard + draggable keybar
 - Theme/font controls for terminal rendering
+- Vendored Nerd Font assets with full glyph/icon support (no external font fetch required)
 
 ## Install
 

webterm/static/fonts/FiraCode-LICENSE.txt

@@ -0,0 +1,93 @@
+Copyright (c) 2014, The Fira Code Project Authors (https://github.com/tonsky/FiraCode)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

webterm/static/monospace.css

@@ -1,9 +1,25 @@
 /* Generic monospace font stack for terminal rendering.
 
 Prefers system monospace fonts, with optional Fira Code / Roboto Mono if available.
-We avoid external font fetching (e.g. Google Fonts) to keep local server self-contained.
+Uses a vendored FiraCode Nerd Font to keep local server self-contained.
 */
 
+@font-face {
+  font-family: "FiraCode Nerd Font";
+  src: url("/static/fonts/FiraCodeNerdFont-Regular.ttf") format("truetype");
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+}
+
+@font-face {
+  font-family: "FiraMono Nerd Font";
+  src: url("/static/fonts/FiraCodeNerdFont-Regular.ttf") format("truetype");
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+}
+
 :root {
   --webterm-mono: ui-monospace, "SFMono-Regular", "FiraCode Nerd Font",
     "FiraMono Nerd Font", "Fira Code", "Roboto Mono", Menlo, Monaco, Consolas,